How to Install the CreepTech Mod for Minecraft:
1. Download latest "Recommended" Forge Installer for Minecraft Version 1.6.4 or 1.7.10: Minecraft Forge Downloads
2. Double-click to Install
3. Download the latest version of the CreepTech Mod for Minecraft v1.6.4 or 1.7.10: CreepTech on Curse.com
4. Place the CreepTech file into the 'mods' folder in your Minecraft Directory (Mac: library/application support/minecraft/mods, PC: C:\Users\You\AppData\Roaming\.minecraft or %AppData%\.minecraft)
5. In the minecraft launcher, select the new '-Forge' version as your minecraft version for your user. 6. Play the game!
For a more thorough explanation, please visit this explainer.